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[Qemu-devel] [Bug 1308542] [NEW] hang in qemu_gluster_init


From: John Eckersberg
Subject: [Qemu-devel] [Bug 1308542] [NEW] hang in qemu_gluster_init
Date: Wed, 16 Apr 2014 13:25:14 -0000

Public bug reported:

In qemu_gluster_init, if the call to either glfs_set_volfile_server or
glfs_set_logging fails into the "out" case, glfs_fini is called without
having first calling glfs_init.  This causes glfs_lock to spin forever
on this bit:

        while (!fs->init)
                pthread_cond_wait (&fs->cond, &fs->mutex);

And here's the bottom part of the backtrace when hung:

#0  pthread_cond_wait@@GLIBC_2.3.2 () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:183
#1  0x00007feceebf58c3 in glfs_lock (fs=0x7fecf15660b0) at glfs-internal.h:156
#2  glfs_active_subvol (fs=0x7fecf15660b0) at glfs-resolve.c:799
#3  0x00007feceebeb5b4 in glfs_fini (fs=0x7fecf15660b0) at glfs.c:652
#4  0x00007fecf0043c73 in qemu_gluster_init (gconf=<value optimized out>, 
filename=<value optimized out>) at 
/usr/src/debug/qemu-kvm-0.12.1.2/block/gluster.c:229

I believe this can be fixed by simply moving the call to glfs_init after
the call to glfs_new but before the calls to glfs_set_volfile_server or
glfs_set_logging.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1308542

Title:
  hang in qemu_gluster_init

Status in QEMU:
  New

Bug description:
  In qemu_gluster_init, if the call to either glfs_set_volfile_server or
  glfs_set_logging fails into the "out" case, glfs_fini is called
  without having first calling glfs_init.  This causes glfs_lock to spin
  forever on this bit:

        while (!fs->init)
                pthread_cond_wait (&fs->cond, &fs->mutex);

  And here's the bottom part of the backtrace when hung:

  #0  pthread_cond_wait@@GLIBC_2.3.2 () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:183
  #1  0x00007feceebf58c3 in glfs_lock (fs=0x7fecf15660b0) at glfs-internal.h:156
  #2  glfs_active_subvol (fs=0x7fecf15660b0) at glfs-resolve.c:799
  #3  0x00007feceebeb5b4 in glfs_fini (fs=0x7fecf15660b0) at glfs.c:652
  #4  0x00007fecf0043c73 in qemu_gluster_init (gconf=<value optimized out>, 
filename=<value optimized out>) at 
/usr/src/debug/qemu-kvm-0.12.1.2/block/gluster.c:229

  I believe this can be fixed by simply moving the call to glfs_init
  after the call to glfs_new but before the calls to
  glfs_set_volfile_server or glfs_set_logging.

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